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$hash{'food'} = 'Apple';
$hash{'food'}{'color'} = 'Red';
print "$hash{food}{color}\n";
print "$Apple{color}\n";

$hash{'food'} = 'Apple';
${$hash{'food'}}{'color'} = 'Red';
print "$hash{food}{color}\n";
print "$Apple{color}\n";

$hash{food}{color} = 'Red';
$hash{food} = 'Apple';

$hash1{'food'} = 'Apple';
$hash1{'food'}{'color'} = 'Red';
...

print "hash1: $hash1{'food'}{'color'} $hash1{'food'}\n";
print "hash2: $hash2{'food'}{'color'} $hash2{'food'}\n";